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07 February 2008 AGE-NC Project No. 96-0254 Page 4 of 5 2.2.1. Feasibility Testing An ozone sparging pilot test has not been performed at the site. Data from soil samples collected at the site indicate that silty sands and gravelly sands are present in the water bearing zone impacted with petroleum hydrocarbons. The site stratigraphy of gravels and silty sands typically possesses hydraulic conductivity values that are favorable for air sparging and ozone injection via air-sparging. Approximately 300 feet south of the site, Tracy Marine Sales: TMS site (2353 Toste Road) is currently operating an ozone remediation system.Ozone sparging was initiated in June 2004 and has been operated discontinuously at the site since June 2004. The ozone injection has operated over a total of 14,000 hours at the 2353 Toste Road site. e `i"�; Dissolved concentrations of petroleum hydrocarbons have decreased significantly and continue to decrease at the TMS site since the initiation of ozone sparging. The reduction of BTEX and MTBE concentrations over the remediation period, exceeds 95 percent. The site stratigraphy of the petroleum hydrocarbon impacted water bearing zone at the TMS site is similar to the stratigraphy of the impacted water bearing zone at the former Curtiss Pontiac-Buick site(silty sands,gravels,and poorly graded sands). Based on the proximity and similarities between the two sites and the success of ozone sparging at TMS site,AGE believes ozone sparging for ground water remediation at the former Curtiss Pontiac- Buick site will be feasible. Additionally, AGE believes the TMS site could be used as a pilot study for the former Curtiss Pontiac-Buick site. 2.2.2. Duration Based on the analytical ground water data acquired prior to the start of the TMS site ozone remediation(high benzene and MTBE dissolved concentrations),the dat&collected since initiation of ozone sparging at TMS site and the current ground water data, AGE estimates 24 months of continuous ozone sparging (chemical oxidation) would be required to mitigate the petroleum hydrocarbon impacted-ground water at the former Curtiss Pontiac-Buick site. 2.2.3. Cost Cost for installation of an ozone system typically ranges from$45,000 to $50,000; with the ozone unit capitol cost at $35,500; including the installation of sparging wells and underground piping. Based on an operational period of 24 months,the cost of the entire project would likely be between $90,000 and $120,000, including ground water monitoring. Advanced GeoEnvironmental,Inc.